Update tests.yml

Author: isabelizimm

.github/workflows/tests.yml

@@ -23,7 +23,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install -e .[dev]
+          python -m pip install -r requirements/dev.txt
+          python -m pip install -e .
       - name: Run Tests
         run: |
           pytest --cov --cov-report xml .